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- Newsgroups: comp.sys.amiga.misc,comp.sys.amiga.advocacy,alt.folklore.computers
- Path: popocat.d-and-d.com!not-for-mail
- From: dnichols@d-and-d.com (DoN. Nichols)
- Subject: Re: First multitasking OS for home computers
- Message-ID: <4cs9gk$i80@windigo.d-and-d.com>
- Keywords: If not, what?
- Sender: usenet@d-and-d.com (Usenet - news on Ceilidh-V)
- Nntp-Posting-Host: windigo
- Reply-To: dnichols@d-and-d.com
- Organization: D and D Data, Vienna VA
- References: <4cmd5g$7h0@coranto.ucs.mun.ca> <4cpcnc$hmg@sue.cc.uregina.ca>
- Date: Mon, 8 Jan 1996 23:31:32 GMT
-
- In article <4cpcnc$hmg@sue.cc.uregina.ca>,
- John Bayko <bayko@ARISTOTLE.CS.UREGINA.CA> wrote:
- >In article <4cmd5g$7h0@coranto.ucs.mun.ca>,
- > George Noel <gnoel@morgan.ucs.mun.ca> wrote:
- >>
- >>What was the first home computer multitasking Operating System that
- >>could handle pre-emptive multitasking? Was it AmigaOS or something
- >>before 1984/85?
- >>
- >>I remember OS/9 on the Tandy CoCo 3 could multitask but could it
- >>premptively multitask or just co-operatively?
-
- It was proper pre-emptive multitasking.
-
- >> Also around which time did
- >>this OS get released?
- >
- > OS/9 ran on the CoCo-1 much earlier (and on non-home computers back
- >around 1980 or 81 I think?).
-
- What do you mean "non-home computers"? I ran OS-9 on a SWTP 6809,
- which was sold as a home/hobbist computer in kit form. More expensive
- version were made by others such as Smoke Signal Broadcasting and GIMIX.
- The GIMIX hardware was particularly interesting, and I have one of their
- floppy controllers (8" and 5.25") which does DMA, making it possible to
- format floppys while multitasking heavily and smoothly.
-
- The manual, which I just checked, had copyright 1980 for Level-1
- OS-9 (64k max memory), 1981 for Level-2 (which expected memory management
- hardware to be present, and which could handle at least 1-2MB of RAM if you
- could afford it.) The actual printed copy of the manual itself bore a 1982
- copyright.
-
- > But if you stretch the definition of both 'multitasking' and
- >'Operating System', then the ZX-81 qualifies, I think - the Z-80 both
- >drove the display, and ran programs in the retrace interval. And it
- >was only $150US (actually, it did this *because* it was only $150US -
- >it only had 4 ICs in the entire thing - Z-80, RAM chip, ROM chip, and
- >glue logic).
-
- Well ... I've not studied the schematics of either the Apple (not
- the Apple-II, but the original, sold without a case, power supply), the
- TRS-80, or the Commodore PET, but all of those were out before the
- Sinclair. Especially given the notorious cost-savings designs in the Apple,
- I would certainly expect the CPU to have been fairly deeply involved in the
- operation of the video. At least in those, the video didn't blank when a
- program was running full speed.
- --
- Email: <dnichols@d-and-d.com> | ...!uunet!ceilidh!dnichols
- Donald Nichols (DoN.) | Voice (Days): (703) 704-2280 (Eves): (703) 938-4564
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- --- Black Holes are where God is dividing by zero ---
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